Mcg to Mg Converter

Convert micrograms (mcg/μg) to milligrams instantly. Free mcg to mg converter with quick reference table and formula. 1000 mcg = 1 mg.

0.001
Milligram (mg)
Input Value
1 μg (Microgram)
One millionth of a gram. Used for vitamins and trace elements.

How to Convert Microgram to Milligram

Simple formula with a worked example

To convert microgram (μg) to milligram (mg), use this formula:

mg = mcg ÷ 1000

Example: Convert 500 μg to mg

500 μg = 0.5 mg

To convert back, use: mcg = mg × 1000

Microgram to Milligram Conversion Table

Quick reference for common microgram to milligram conversions

Microgram (μg)Milligram (mg)
1 μg0.001 mg
2 μg0.002 mg
5 μg0.005 mg
10 μg0.01 mg
25 μg0.025 mg
50 μg0.05 mg
100 μg0.1 mg
250 μg0.25 mg
500 μg0.5 mg
1,000 μg1 mg

About Microgram and Milligram

Understanding these weight units

Microgram (μg)

One millionth of a gram. Used for vitamins and trace elements.

Milligram (mg)

1/1000 of a gram. Used in medicine and for very small quantities.

When You Need This Conversion

  • vitamin dosage (B12, D, folate)
  • medication prescriptions
  • supplement conversion
  • nutrition labels

Did you know? Many vitamins are measured in micrograms — for example, the daily recommended intake of Vitamin B12 is just 2.4 mcg (0.0024 mg).

Frequently Asked Questions

Common questions about converting microgram to milligram

Embed Mcg to Mg Converter

Add this calculator to your website or blog for free.